<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script>
      var sep = "!";
      var str = "";
      var arr = ["red", "green", "blue", "pink"];
      for (i = 0; i < arr.length; i++) {
        str += arr[i] + sep;
      }
      console.log(str);
    </script>
  </head>
  <body></body>
</html>
